Mit diesem Script lässt sich die Eingabe eines Datums auf click validieren. So kann einfach ein falsch eingegebenes Datumsformat in ein akzeptiertes Format gewandelt werden.
Autor: unbekannt
zur Demo
in <head> einfügen
<script type="text/javascript">
function check_date(field){
var checkstr = "0123456789";
var DateField = field;
var Datevalue = "";
var DateTemp = "";
var seperator = ".";
var day;
var month;
var year;
var leap = 0;
var err = 0;
var i;
err = 0;
DateValue = DateField.value;
/* Delete all chars except 0..9 */
for (i = 0; i < DateValue.length; i++) {
if (checkstr.indexOf(DateValue.substr(i,1)) >= 0) {
DateTemp = DateTemp + DateValue.substr(i,1);
}
}
DateValue = DateTemp;
/* Always change date to 8 digits - string*/
/* if year is entered as 2-digit / always assume 20xx */
if (DateValue.length == 6) {
DateValue = DateValue.substr(0,4) + '20' + DateValue.substr(4,2); }
if (DateValue.length != 8) {
err = 19;}
/* year is wrong if year = 0000 */
year = DateValue.substr(4,4);
if (year == 0) {
err = 20;
}
/* Validation of month*/
month = DateValue.substr(2,2);
if ((month < 1) || (month > 12)) {
err = 21;
}
/* Validation of day*/
day = DateValue.substr(0,2);
if (day < 1) {
err = 22;
}
/* Validation leap-year / february / day */
if ((year % 4 == 0) || (year % 100 == 0) || (year % 400 == 0)) {
leap = 1;
}
if ((month == 2) && (leap == 1) && (day > 29)) {
err = 23;
}
if ((month == 2) && (leap != 1) && (day > 28)) {
err = 24;
}
/* Validation of other months */
if ((day > 31) && ((month == "01") || (month == "03") || (month == "05") || (month == "07") || (month == "08") || (month == "10") || (month == "12"))) {
err = 25;
}
if ((day > 30) && ((month == "04") || (month == "06") || (month == "09") || (month == "11"))) {
err = 26;
}
/* if 00 ist entered, no error, deleting the entry */
if ((day == 0) && (month == 0) && (year == 00)) {
err = 0; day = ""; month = ""; year = ""; seperator = "";
}
/* if no error, write the completed date to Input-Field (e.g. 13.12.2001) */
if (err == 0) {
DateField.value = day + seperator + month + seperator + year;
}
/* Error-message if err != 0 */
else {
alert("Date is incorrect!");
DateField.select();
DateField.focus();
}
}
</script>
in <body> eingeben
<FORM name="datecheck">
<TABLE border="0" width="60%">
<TR>
<TD>
Enter Date (Use European format shown at right)<P>
<INPUT type="text" name=testdat size='10' maxlength="10" onblur="check_date(this)">
<INPUT type= "submit" name="button" value="Press to Validate"><p>
(Date is validated after leaving the field.)
</TD>
<TD>
<b>ddmmyy</b> (171201) or <BR>
<b>ddmmyyyy</b> (17122001) or <BR>
<b>ddXmmXyy</b> (17-12-01 or 17y12q01 ... ) or <BR>
<b>ddXmmXyyyy</b> (17.12.2001 or 17,12,2001 ...) <br>
where "X" is any sign not in 0..9, i.e. "-" or "/"<p>
</TD>
</TR>
</TABLE>
</FORM>
</CENTER>
|